A Transformation Optics Device From Metallic Metamaterials At Microwave Frequencies

Metamaterials can realize exotic characteristics that do not exist in nature materials.Recently, electromagnetic metamaterials, a new and interdisciplinary field, have becomeone of the hottest topics both in theoretical exploration and experimental verification inrecent years. In the past years, the artificial electromagnetic and negative refractionproperties of metamaterials have been proved to be different from the nature materials.Further study has shown that one can control physical parameters by tuning various levelsof orderly structures. Electromagnetic metamaterials have been proved to have moreproperties and applications. Transformation optics (TO) based on metamaterials hasbecome an important branch of optics and material science, which aims to tune the path oflight according to coordinate transformation. In other words, TO is to tune light on thebasis of controlling refractive index. In this paper, we study a transformation optics devicefrom metallic metamaterials at microwave frequencies. The specific arrangement is asfollowing:In chapter one, we introduce the background of the thesis and advances at home andabroad. In particular, we introduce the development of transformation optics andmetamaterials, applications of perfect lens and the metamaterials with refractive index nearzero.In chapter two, We introduce the principle of waveguide system and emphaticallyanalyze the derivation process of the reflection and transmission coefficient in TE10mode.In this chapter, we also introduce the finite-difference time-domain (FDTD) method andthe finite element (FEM) method.In chapter three, we investigate different kinds of H-fractal structures and analyze their effective electromagnetic parameters. In practice, scientists simulate various kinds ofmetamaterials unit cells and use the effective electromagnetic parameters in designingtransformation optics devices with index near zero. They don’t pay too much attention onevery kind of fractals. In this chapter, we introduce a new transformation optics device--anInside-out Eaton Lens. The new lens has the advantage on its source point and image pointplaced in air background. Besides, our research has made the experiments and fabricationmore convenient.In chapter four, we focus on the simulation and analysis work of isotropic negativepermeability in a three-dimensional dielectric composite at microwave and terahertzfrequencies.